In the middle of the night, the man leans over and wakes the woman, "I'm sorry to bother you, but I'm awfully cold and I was wondering if you could possibly get me another blanket?" 

The woman leans out and, with a glint in her eye, says, "I have a better idea... just for tonight... let's make pretend that we're married." 

The man replies with excitement, "Okay! Sure!" 

"Good," says the woman, "get your own damn blanket!"